JEE Math Practice Question
The two lines $$x=ay+b,z=cy+d$$ and $$x = a'y + b',z = c'y + d'$$ will be perpendicular, if and only if :
- A.$$aa' + cc' + 1 = 0$$
- B.$$aa' + bb'cc' + 1 = 0$$
- C.$$aa' + bb'cc' = 0$$
- D.$$\left( {a + a'} \right)\left( {b + b'} \right) + \left( {c + c'} \right) = 0$$
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